| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| Conservation Directory 2015: The Guide to Worldwide Environmental Organizations | 978-1-63144-010-6 (1-63144-010-1) | 2015 |
| Conservation Directory 2017: The Guide to Worldwide Environmental Organizations | 978-1-63144-050-2 (1-63144-050-0) | 2016 |